COF-C03: SnowPro Core Certification

By Snowflake · Question Mode

QuestionQ28

VerifiedPerformance Optimization, Querying & Transformation

A dashboard query is executing far more slowly than expected. Query Profile indicates that a join operator consumes 70% of total execution time and produces 1,000 times more rows than its input tables.

What is causing this problem?

Explanation

An exploding join occurs when a missing or incorrect ON condition allows unintended combinations of rows, potentially creating a Cartesian product. It produces orders of magnitude more output rows than its inputs and can make the join operator consume most of the execution time.

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